Find the value of "a" if a line containing the point (a,-3a) has a y-intercept of 7 and a slope of -2/3.
Thanks!
Thanks!
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two points:
(a, - 3a) and (0, 7)
slope = m = (7 + 3a)/(- a) = - 2/3
solve for a: 3(7 + 3a) = 2a
21 + 9a = 2a
7a = - 21
a = - 3
@Σ
(a, - 3a) and (0, 7)
slope = m = (7 + 3a)/(- a) = - 2/3
solve for a: 3(7 + 3a) = 2a
21 + 9a = 2a
7a = - 21
a = - 3
@Σ